第五章|连续时间信号的数字处理 小结: (a)C/D X) mpule to|xln」 sequence s(t) x sequence to /S(l H(Q) xX (b)D/C impulse X(e)=∑Xa 2丌k -00 H, (Q2) 若Ti足够小( Nyquist), 则,X(2)=X(e)H,(Q2) Ⅹ.(2 Q QQ T,〖g2<Ω 式中,H,(A9)= 0,其它 数字信号处理精品课程    <   = =   =  = −   =−  0, . , , ( ) ( ) , ( ) ( ) ( ) is (Nyquist) , ) 2 ( 1 ( ) 其 它 式中， 则 若 足够小 c r a r j T r k a j T H j X j X j X e H j T T k j T X j T X e    X Impulse to sequence ( ) ( ) ( ) [ ] s t x t x t x n c s (a) C/D sequence to impulse Hr (jΩ) x[n] x (t) x (t) s r (b) D/C −c c  H ( j) r T 小结：